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method for preparation of methacrylic acid by catalytic oxidation of methacroleien and method for preparation of oxide phosphorus, molybdenum and vanadium containing catalystand the formed catalyst for oxidation.
method for preparation of methacrylic acid by catalytic oxidation of methacroleien and method for preparation of oxide phosphorus, molybdenum and vanadium containing catalystand the formed catalyst for oxidation.
